chore(api): Update generated-file header attribution to Castiron

[apcha-oai]

Summary

chore(api): Update generated-file header attribution to Castiron

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 12.106s for Python SDK PR #3583.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	200ms
tests/chat-completions-create.test.ts	✅ Passed	257ms
tests/chat-completions-stream.test.ts	✅ Passed	133ms
tests/files-content-binary.test.ts	✅ Passed	303ms
tests/files-create-multipart.test.ts	✅ Passed	257ms
tests/files-list-pagination.test.ts	✅ Passed	163ms
tests/initialize-config.test.ts	✅ Passed	231ms
tests/instance-isolation.test.ts	✅ Passed	224ms
tests/models-list.test.ts	✅ Passed	226ms
tests/responses-background-lifecycle.test.ts	✅ Passed	297ms
tests/responses-body-method-errors.test.ts	✅ Passed	374ms
tests/responses-cancel-timeout.test.ts	✅ Passed	247ms
tests/responses-cancel.test.ts	✅ Passed	336ms
tests/responses-compact-retries.test.ts	✅ Passed	356ms
tests/responses-compact.test.ts	✅ Passed	319ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	338ms
tests/responses-create-advanced.test.ts	✅ Passed	276ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.264s
tests/responses-create-errors.test.ts	✅ Passed	217ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	255ms
tests/responses-create-retries.test.ts	✅ Passed	301ms
tests/responses-create-stream-failures.test.ts	✅ Passed	141ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	212ms
tests/responses-create-stream-wire.test.ts	✅ Passed	3.932s
tests/responses-create-stream.test.ts	✅ Passed	109ms
tests/responses-create-terminal-states.test.ts	✅ Passed	284ms
tests/responses-create-timeout.test.ts	✅ Passed	241ms
tests/responses-create.test.ts	✅ Passed	307ms
tests/responses-delete.test.ts	✅ Passed	218ms
tests/responses-input-items-errors.test.ts	✅ Passed	375ms
tests/responses-input-items-list.test.ts	✅ Passed	344ms
tests/responses-input-items-options.test.ts	✅ Passed	306ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	267ms
tests/responses-input-tokens-count.test.ts	✅ Passed	274ms
tests/responses-malformed-inputs.test.ts	✅ Passed	3.008s
tests/responses-not-found-errors.test.ts	✅ Passed	313ms
tests/responses-parse.test.ts	✅ Passed	445ms
tests/responses-retrieve-retries.test.ts	✅ Passed	262ms
tests/responses-retrieve.test.ts	✅ Passed	250ms
tests/responses-stored-method-errors.test.ts	✅ Passed	775ms
tests/retry-behavior.test.ts	✅ Passed	3.29s
tests/sdk-error-shape.test.ts	✅ Passed	319ms

View OkTest run #31143842132

_{SDK merge (91e0ae299a08) · head (b0f95b511d76) · base (0c09a3fe8151) · OkTest (91635c6a2723)}

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[jbeckwith-oai]

The attribution update itself is clean across the 1,462 generated source/test files, but this regeneration also changes the published API contract in api_reference/openapi.transformed.yml: it removes minLength: 1 from NamespaceToolParam.description and BetaNamespaceToolParam.description. That is unrelated to the stated attribution-only change and weakens validation for those two schemas. Please regenerate against the same input/transform behavior or otherwise restore those constraints so this PR is limited to the header attribution (plus generation metadata).